condition mean min max ZT0-3 20.624442 20.624442 20.624442 ZT4-7 35.222663999999995 35.222663999999995 35.222663999999995 ZT8-11 40.8917645 40.8917645 40.8917645 ZT12-15 35.946269 35.946269 35.946269 ZT16-19 34.695191 34.695191 34.695191 ZT20-23 21.234802000000002 21.234802000000002 21.234802000000002